This map visualization displays world country boundaries as green polygons on a light gray sphere, with hover effects turning countries red and tooltips showing country names. It loads TopoJSON data from the world-atlas package, converts it to GeoJSON using `topojson.feature`, and renders it with `d3.geoPath` using the `geoNaturalEarth1` projection. The map supports zooming and panning through `d3.zoom`, with the zoom transform applied to an SVG group element. Population data from data.csv is not visually encoded.